Speedometer



June 27, 1933. K. REZSNY SPEEDOMETER Filed Aug. 9, 1929 4 'Sheets-Sheet l June 27, 1933. K. REzsNY SPEEDOMETER Filed Aug. 9; 1929 4 Sheets-Sheet 3 K. REZSNY June 217, 1933.

SPEEDOMETER Filed Aug. 9. 1929 4 Sheets-Sheet 4 Patented June 27, 1933 L UNITED STATES PATENT x'olioMAN REzsNY, 0F BUDAPEST, HUNGARY, AssIGNoR VTo THE FIRM' HY'Ditoivrnfirnv Arc., or BRESLAU c i SPEEDOMETER `Application led August 9, V1929, Serial No.

My invention relates to improvements in positively driven speedometers and more particularly to positively driven speedometers-or locomotives and the like.

` t is an lobject of the invention to procure a speedometer of the kind described above, which is of simple construction and which is reliable in operation. i

Another object of the invention is to improve the construction of the measuring and setting parts of speedometers. n

A further object of the invention is to procure a device for the automatic winding up ot speedometer clockworks.

lStill further objects of the inventionl are to procure novel and advantageous4 devices forv recording the time indications and the direction of driving on the recording strips of a speedometer.

' A constructional form of my invention is shown 'by way of an example in the accompanying drawings, in which f Fig. l is an elevation of the lentire speedometer device with a wall of the casing removed.

Fig. 2 is a section on thel line II-II of Fig. 1,

Fig. 3 is a sectional view of the clockwork.

Fig'. 4 shows a detail of the clockwork on an lenlarged scale. v y

Fig. 5 shows the recording strip.

Fig. 6 shows the driving means of the device for recording the direction of driving.

Fig. 7 is a partial section on the line VII- VIIo Fig. 6, l Y

Fig. 8 is a section on the line VIII-VIII of Fig. 6,

Fig. 9 is a section on the line Iii-JX of Fig. 6. l

In the casing A of a speedometer yis mounted the vertical driving spindle -2 which is ydriven for instance from a locomotive wheel by means of a suitable gear. On vthe said driving spindle is arranged a sleeve 1 with a worm 3 which is always driven in one direc-tion Jfor instance in the'direction of the arrow -I (Fig. 2), by a reversing gear which is constituted for `instance by thev bevel wheels 4. The worm 3 engages with a worm 384,762, and in Germany Angustia, `192s.

wheel 6 'which is mounted 'on thehorizontal measuring spindle 5 and' rigidly secured to a driving wheel 7 provided with lateral teeth.

meshing with awide toothed wheelll. The

latter is mounted on the spindle l'supported in the bracket 12 and is rotated' by a spring 14 in such a manner that itis pressed with one ot the pins 1:5 provided on it, against a fixed stop 16. Thedisc 8, the sleeve9 and the wheel 10, form the rso-called `measuringv part and are jointly designated by M. '4

The sleeve 9 is provided: with an annular' groove 17 with which engages a control lever 18 pivotally arranged on a spindle 40, andfis mounted on the measuring spindle 5in a rotatable and laterally adjustable manner.V A

pin 19 provided on the wheel 10` co`operates with the pin 20. of a toothed wheel 21 provided with Vlateral ratchet teeth 21a, .the said wheel 21 being Vrotatable with itshub 22 on-y the measuring spindle 5, but prevented from moving 1n the lateral direction. (For the vsake of simplicity the pins 19 and 20 have not beenl shown in Fig. 2;) The toothed wheel 21 meshesV with a toothed wheel 23 which is also'mounted on'th'espindle l'and rotated by a spring 24 in the direction `like thewheel 11, that is, until a pin (not shown) on the same strikes a iiXed stop.` A toothed wheel 27 is further secured to ormadeintegral with the hub'22 which wheel meshes with a toothed rack 28 which operates the recording device which will be described' in detail later on'. To the hub 22 is furthersecured a bevel wheel 29vwhich drives through the kbevel wheel V3() the spindle 31 of ,the pointer-32.

The parts'21, 22, 27, 29 Jform together the 65 j so-called'setting part and are jointly designated by E. I

A toothed wheel34, which is rotated from the driving spindle 2 drives through the intermediate wheel 35 a toothed wheel'36 which V1s mounted "on the so-called time spindle 37,

. the uniform movement of which is regulated by a known anchor escapement not shown here. To the lower end of the time spindle is secured the control disc 38 which carries cams or bosses with two steps 391, 392 of diiferent heights.V On the horizontal spindle 40 of the control lever 18 is rotatably A mounted a sleeve41 which carries a downvward arm 42 which is constantly pulled by aIspring-43A against the control disc 38. v:The

arms 18 and 42 form together the so-called control lever.

`Locking pawls 44 and 45 engage with the lateral ratchet teeth of the toothed wheels 10 and 21 respectively which pawls are connected together by an intermediate rod 46 and pulled by the' spring 47 to the left so that in the position of rest the intermediate rod 46 allows only the pawl 45 to press against the ratchetteeth 21a of the toothed wheel 21, whilst the pawl 44 remains disengaged. This pawl` is .controlled by the adjustable toothed wheel 10.

The working of the arrangement is as follows: y Y

The driving spindle 2 drives the worm 3 through the reversing gear always inY one direction (arrow I) and the worm wheel 6 is rotated correspondingly. The driving spindle 2 always windsthe clockwork spring, owing to which the time spindle 37 is rotated in the directionof the arrow II Vin Figure 2. By means of an anchor escapement not shown in the'` drawings, the time spindle 37 is `given a uniform rotation, that is, it makes for kinstancesiX revolutions per minute. o Y

The spring 43 pulls the arm 42 of the con- `trol lever towards the control disc 38, at the same time the drivingr wheel 7 and the toothed disc 8 are in mesh, so that the toothed wheel 10 is also rotated at the same time. By means of the pins 19 and 20the toothed wheel 21 is also driven, owing to which the pointer 32 is deflected at the same ltime in accordance with the speed at the moment. When one of the cams or projections of the control'disc 38 arrives opposite the arm 42, the latter'will lbe forced back by the foremost and highest step 391, and the coupling between the wheel 7 and the measuring part M'will be disconnected, at the same time thetoothed wheel 10 will be held fast in its position by the locking pawl 44l .i

yThe toothed wheel 1 0 willbe forced however tothe right tov such an extent that the pawl 44 will push away .the other pawl 45 by means of the intermediate rod 46 to such anV extent that the toothed wheel 21 will be releas-ed. The return of the wheel 21 is, however, rendered impossible vin that its stop 2O bears against the stop 19 of the locked wheel 10.A Owing vto the movement of the measuring lpart M, the pawl 44 has been brought of the pointer, the measuring part is held fast. When now the second lower step 392 comes into engagement ywith the lever 42, the lever will push the measuring part M slightly to the left, without however the latter coming into engagement with the driving wheel 7.. .During that time the toothedwheel 21 will be locked again by the pawl 45'and in that way the pointer liXed. In this positionv of -the lever, thefmeasuring part ywill be released by the pawl 44, so `that owing to the rotation by the toothed wheel 1l, it willbe turned back until the toothed wheel 11 reaches lwith its pin 15 the stop 16. The measuring part is now back again in its initial posit-ion. The cam step 392 passes then beyond the lever arm 42, so that the latter will be completely released, whereupon the .meas-V uring part will be again coupled to the driving wheel-7, and vthe measuringV will vbe re-k peated.

The single stepwise advance movements always takeY place between two `escap'ement impulses i. e. the Alever controlled by cams must drop from the cam intermittently kbe-y tween every two escapement impulses whereby the advance .movements take place 1nstantaneously and the single periods, such as the measuring time and the setting time, are

separated fromone another in avery precise o It will beseen that the measuring partM drives thefsetting part E directly, that'is, in such a manner that the pin 19` byits .cir-

cular'movement transmits themovement direct to the pin 20. The toothed wheels l1 and 23 of the device for re-setting enable the stops to be .arranged not on the measuring part ,and setting part, but on the toothed wheels 11 and 23, owing to which/the measuring part and they settingpart are protectedfrom hard shocks, and these parts are 'not acted upon by the re-set-tingsprings 14 and 24 during the standstill of the vehicle. `In that way the. apparatus runs more easily during the standstill, and thewear is therefore much smaller.

On; the driving spindle 2ai1`,eccentricr `los nu A

disc48 -is located, which operates arod 49 the secured `by means of hooks 57 to the casing of '125 th-e barrels and by means of hooks 58 to the hub ofthe next barrel. These mainsprings are thereby-'connected together in. series 1n the ,known manner in order .toobtain the greatest possible lengthof spring anda long runningdown time..V A. 'y v o The ratchet wheel 52 is integral with the. driving wheel 59.. and is rigidly secured lto the winding spindle 51,.` )Vith the teeth of the driving lwheel 59 engages the driving pawl 60 (Fig. 4) which is rotatably kmounted on the pin 62 secured to the bottom 61 of the lowermost spring barrel. This bottom has the form of a brake Awheel and is equipped withratchet teeth.,v A pawl63 (Fig. 2) Vprevents a rotationto the right. fVVhen there fore the driving'` wheel 59'is turned in the direction `of the arrow yIII, this Vrotationv is transmitted through the driving pawl 60 and pin 62 to the bottom or brake ywheel 61 and to the hub 6410i the same and thereby successively to the single main springs. uppermostbarrel is rigidly secured tov a toothed wheel 34 and drives as mentioned above by means of the countershaft constituted by the-toothed wheels 35, 36, the socalled time spindlei37.

,One ofthe spring barrels is provided throughout the whole ofv its height with'te'eth 65, andthe spring box above it, is provided at th-e top with vanarrow toothed ring 66. In a sleeve 67 mounted on the casing A, and ina bracket 68 is mounted `in an adjustable and rotatable manner the control spindle 69 to which is secured a wide toothedwheel `70 co-operating with the toothed wheel 65.` The wheel 70 is connected to a fixed or loose cylindrical hub 71A extending downwards. Between `the arms 72 of the bracket 68 is arranged a toothed wheel 73 which co-operates with the toothed wheel 66. The control spindle y6,9 is provided at the top with a left hand flat screwthread 7 4 on which is mounted the toothed wheel 73 formed vinto a nut.

The driving pawl has a projection or arm 7 5 (Fig. 4) and to this arm a flat pressure spring 7 is fastened by means of rivets or screws 76. On the pin 62 a U-shaped protectivefcap 78 is pivotally arranged and the spring 77 pressesthis cap outward against a stop 80. A second spring 81 presses the driving pawl 60 against the driving wheel 59.

The winding spindle 51 may also be rotated by means of a hand whe-el 82.

The working of the device is as follows:

When the vclockwork is completely run down the singlev parts are in the positions shown in,v Figs. 2 and 4 and the driving wheel 59 is constantly rotated in the direc tion of the arrow III by the driving spindle 2 or by thehand wheel 82.

)Vhena mainspring is fully wound for instance to the extent of six turns, the uppermost mainspring hub will make 6 revolutions, the second hub l12, the third hub 18,

the fourth hub 24,-the1fth 30, the sixth 36 and the lowermost 42 revolutions. It follows therefrom that during the full winding the toothed wheel makesv six revolutions more r than the toothed wheel 66, Aand'that the The toothed wheel rotates to the right faster thanV theto'othed wheel 73, so that the con# trol spindle 69- will be lowered, that is to continue to rotate'so that the mainsprings 56 will gradually run down. The wheel 66 rotates during that time faster than Y the wheel 65, and the control spindle `69 with the hub 71 slightly rises so that the driving pawl 60 is released again, and thewinding takes place again. This is possible, as the pawl 60 unhindered may pass the control spindle 69, because the releasing hub 71 now take-s up a higher position than the pawl 60. When the driving spindle 2 is constantly rotating, the control spindle 69 regulates the spring tension between quite small limits and when the engine shaft stops, the mainsprings are allowed to run down until the wheel 70 in the bracket 68 has reached the bottom.

As mentioned above, `the toothed wheel 34 of the uppermost spring barreldrives through the toot-hed wheels 35, 36 the time spindle `37. On the shaft of this gearing a worm 88 (Figures 1 and 2) is arranged which through a worm wheel 89, a spindle 84 and a toothed wheel 85 drives a toothed wheel 90, which makes one revolution every hour. WithV this wheel the hour wheel 91 is rigidly connected y which also makes one revolution every hour. This wheel is formed with four raisingcams of which the rst three, 92 (Fig. 1) are identical, whereas the fourth cam 93 is somewhat steeper than the others. Each cam has an inclined end and is formed with l5 equal sharp teeth or cuts 94. The last tooth of each cam is connected `with the first tooth of the Y neXt cani by means ofan inclined face. -On the said cams a lever or arm 96 slides, which isy pivotally arranged on a pin 95. This arm 96 cooperates with the'said cams by means of a tooth 97 and transmits its movements to the recording rod 99 by means of a projec tion 98. The hourwheel 91, which is driven from the clockwork, carries the minute hand 32. At the upper end ofv the vrecording rod 99 the recording pencil 102 is mounted, which records the time line 103shown in Fig-5 on the strip 108. The timeline consists ofa l height, whilst in the last quarter of an hour this rise is strikingly steeper so that the end 104 of the last quarter of an hour can vbe easily noticed, especially as the ends105 of the intermediate quartersof .an hour are lower'. Every minute (small time unit) a small stroke 106 is madeso that the single minutes can be easily distinguished on the time line; The minute strokes and the last strokes' of the single quarters of an hour represent the 15th, 30th and 45th minute of an hour.. The last stroke, of the fourth quarter of an hour represents at the saine time ythe moment of a full hour: which is marked 107 in Figure 5.V It is evident, that the first strokes. represent the first. minutes of each quarter of anhour7 that is to say the 1st, 16th, 31st and 46th'minute. AIt is therefore easy to read in Figure -,t-hat va train arrived for instance at hours and minutes, left minutesafterwards and` arrived at the next station-at X 1n.8 minutes and continued its journey after two minutes.

rilhis method ottime recording has the great advantage that thetiine recording inr full hours (large timeunit) Vquarters of an hour (medium time unit) and minutes (small time unit) is. very clear, and that one simply reads from left to rightthe minutes, owing to which the strip may be made of a. considerably smaller width than in the construction hitherto known.

It will be readily understood thatthe pencil 102at the end of each quarter of an hour will draw the inclined lines 104, 105, that the .timel line 103 rises gradually during each quarter of an hour, whereby the last quarter of an hour will be drawn higher and that each minute there will be produced a vertical minute stroke 106. The recording strip 108 may of course be moved according to time also during the trip or journey. In order that also the direction ofv driving may be recorded on the recording strip the speedometer according to the invention is equipped with a special f device which `will now be described.

In order that the direction of travel, that is to say, the forward or backward travel of the vehicle, may be recordedk on the'recording strip 108, the following system is provided:

The recording'strip .108 is guided over a plate 109 shown in Figure 7. A pencil 83, which is mounted on an arm 110 of a rod 134 produces on thestrip 108 a thinstraight line during the forward travel of the vehicle and a thick straightline when the vehicle is travelling backwards. The rod 134, whose drive is hereinafter described, is prevented from rotation inthat an arm 112 (Figs. 6 and 7) mounted on the cross spindle 40. To the said arm is secured at thetop a rod-like arm` I part- 121 and at the bottom a flat spring 122 (Fig. 8). lThe bevel gears 4 of the sleeve 1 cooperate with claws 125, 126 guided by pins 123, 124 and the armpart 121and theflat spring y122 project between the said `claws and'force them apart. 'It will be clearly seen from-the drawing that during the forward travel (direction of the arrowI of Fig; 9) the claw. 126 directly drives the upper bevel wheel, that'is to say,.it merelyrotatesit While the rotating claw 1 25 runs idly'in that it i slides over the teeth of the lower wheel 4 and moves up and down.

The axial movementsy of the claw 125`are also-transmitted to the tension spring 122 whilst thel arm part 121 remains at rest. To the sleeve 119 is secured a second arm 127 which is connected by a pin 128 to a lifting rod 129 for the recording rod 134 extending through the sleeve 115. During the forward travel, the pencil 83' remains stationary and writes on the strip 108 a thin straight line indicating the forward travel; When the vehicle is travelling backwards,the claw 125 will drive the lower bevel wheel 4 and theisleevey 1 over the two other bevel wheelsvanrd make only a rotary movement while the claw 126 makes a reciprocatory movement. by the arm part 121 through the parts 120,

This movement is transmittedy 119, 127 128, 134, 110 to the pencil 83 thereby .n

producingl a thick line which indicates the backward travel and can be easily distinguished. The thickness of this thickA line depends on the play` 132 (Fig. 6) between the sleeve 119 and the rod 134. This play may also be provided, for instance, betweenythe lifting rod129 and the arm 127. y

v The device produces on the recording stripy a measuring device adapted to rotate inter-4 mittently and then return to the initial position, a setting device including an axially displaceable wheela single joint control lever for throwing said measuring device in and out of gear and for releasing and. locking said setting device and means for operating said control lever.

2. Ina speedometer with positive drive, a measuring device adapted to rotate intermittently and thenreturn to the initial position, av setting-device, a single joint control lever for throwing` saidmeasuring device ink rand out of'gear andfor releasing and locking said setting device .means for operating j said control lever and other interconnected means for lockingr the measuring device during the setting of the setting device and vice versa.

. 3. In a speedometer with positive drive, a measuring device adapted to rotate intermittently and then return to the initial position, a setting device, a single joint control lever for throwing said measuring device in and out of gear and for releasing and locking said setting device, means for operating said control lever, other interconnected means for locking the measuring device during the setting of the setting device and vice versa and still other means for automatically bringing said measuring and setting devices back to initial position after each period of activity.

4. In a speedometer With vpositive drive, a measuring device adapted to rotate intermittently and then return to the initial position, a setting device, a single joint control lever for throwing said measuring device in and out of gear and for releasing and locking said setting device, a control disc With steps for bringing the control lever into different positions for the purpose of obtaining different effects, two-locking paWls of the measuring device and the setting device being so interconnected, that vduring the period of the greatest deflection of the measuring device the second paWl is held disengaged by the first paWl, in order to enable the setting of the setting device. f

5. In a speedometer with positivel drive,

.spring constitute a fork.

a measuring device adapted to rotate intermittently and thenl return to the` initial position, a setting device, a single joint control lever for throwing said measuring device in first paWl, in order to enable the setting of the setting device, and the measuring device is engaged by the first paWl during the setting operation and spring controlled means for automatically bringing said measuring and setting devices back to initial positionvafterV each period of activity.

6. In a .speedometer with positive drive,

a direction indicating marker, a drive shaft,

tvvo sleeves slidable on said shaft, and means for transmitting sliding movement of said sleeves to said marker, said movement transmitting means including a rigid member and a spring pressing said member against one of said sleeves. y

7. A, speedometer as claimed in claim 6, characterized in that said rigid'member and Intestimony whereof I affix my signature.

KOLOMAN REZSNY. 

